The CBI on Wednesday said it has arrested Delhi-based broker and Managing Director of OPG Securities Sanjay Gupta in the NSE scam, four years after the agency registered an FIR against him for alleged preferential access of the market through multiple IDs and secondary servers called co-location facility.

The CBI has alleged that it received information that Gupta along with some people attempted to destroy some evidence and also tried to influence SEBI officials which were probing the NSE co-location scam case.

The agency had summoned Gupta to its headquarters and during the questioning, Gupta was "evasive" and tried to "mislead the investigation" resulting in his arrest on Tuesday night, they said.

Gupta had allegedly approached members of a syndicate to bribe SEBI officials on his behalf and influence the investigation, they alleged.

The CBI is probing whether the bribes paid to the syndicate members reached SEBI officials or not, they said.

Four years after registering the FIR, the agency began taking action following a damning SEBI report in February this year in which strictures were passed against the then NSE CEO and Managing Director Chitra Ramkrishna and Group Operating Officer Anand Subramanian. It is alleged that OPG Securities consistently logged in first on selected Tick-by-Tick servers of the NSE for four years on most of the trading days between 2010 and 2014 and also had access to servers that had better hardware.

A tick is a minimum change in the price of security. It is alleged that Tick-by- Tick architecture used by the NSE was manipulated by brokers to remain ahead of peers in trading hours.

The CBI had earlier arrested Ramkrishna and Subramanian, not named in the FIR, in connection with the case and both are undergoing judicial custody since March.

The special court had repeatedly questioned the CBI about the action it has taken against other accused -- Gupta and OPG Securities--named in the FIR.

The CBI has alleged that Gupta was one of the main beneficiary of the co-location facility started by the NSE which helped him get favourable access to the market over other brokers through multiple logins and access to secondary servers giving him crucial time advantage and resulting in a multi-fold increase in profits of his company in just two years.

The facility allowed the users to get access to the prices ahead of others, they added.